关于下图所示各装置的叙述中，正确的是                    （   ）

按要求填一填。

    Hi，I'm Betty.I come from Sydney.I'm a student.I eat breakfast at home.And then I go to school at 8：30.Classes start at 9：00.After school，I usually play sports with my friends.On the weekend，I often take a dancing class and play music.Sometimes I watch TV and read books.

    My favourite season is summer.Because Christmas is in summer.In Australia，summer is from December to February the next year.I usually go to the beach and swim on Christmas Day.What about you?

李明的爸爸妈妈在离家很远的地方上班，李明想在暑假为父母分担家务，他买回面粉，学做馒头，第一天中午他和好面，用盆装好盖上盖子，放在桌上，第二天早晨准备蒸馒头时，发现面并没有发泡而是发酸，你能告诉他，做馒头的一些基本常识吗？